2017 Ford Mustang 5.0L Petrol · ROY 510W

The defining mechanical story of this 2017 Ford Mustang centres on a front brake and wheel bearing issue that surfaced sharply on 11 June 2026, resulting in a failed MOT with two Major defects recorded against the front service brake lagging in operation and the nearside rear wheel bearing exhibiting excessive play. The vehicle was presented again just four days later on 15 June 2026 and passed, although the offside front tyre cracking/perishing advisory from the failure was carried forward, and a further pass on 1 July 2026 carried the same recurring tyre advisory. The trajectory is therefore one of a single, isolated mechanical episode that has since been resolved at test, but the underlying components warrant close scrutiny. The persistent advisory against the offside front tyre across three consecutive tests is notable, suggesting the carcass damage or sidewall perishing has either not been fully rectified or is recurring due to kerbing or age-related rubber degradation. At 46,717 miles over nine years, this Mustang has accumulated an average of roughly 5,191 miles per year, which is well below typical annual mileage for a vehicle of this age and type. Such low usage generally reduces wear on major drivetrain components but raises the prospect of extended standing periods, which can be particularly relevant given the failure profile. The MOT history shows annual testing continuity through 2024 and 2025, with two tests clustered tightly in June and July 2026, suggesting the vehicle has remained in active use rather than being laid up for prolonged periods. Mechanically, low annual mileage on a performance-oriented rear-wheel-drive car tends to mean longer fluid residency in the braking system and differential, and any standing periods could exacerbate bearing wear through uneven loading and infrequent lubrication cycling, which is pertinent given the recorded rear wheel bearing play. A prospective buyer should focus the pre-purchase inspection on the braking and suspension components specifically flagged in the June 2026 failure. The front service brake lagging in operation suggests the offside front caliper or its hydraulic actuation may have been sticking or failing to apply fully, and during a test drive any pulling to one side under braking, a spongy or uneven pedal feel, or evidence of uneven disc wear on the offside front should be investigated. The nearside rear wheel bearing excessive play warrants a physical check for any rumbling, humming, or droning noise that increases with speed and diminishes when cornering, which is the classic signature of a worn rear hub assembly; the bearing housing and stub axle area should be inspected for signs of recent replacement or ongoing wear. Additionally, because the offside front tyre advisory has now appeared on three consecutive tests, the buyer should confirm whether the tyre has been replaced or merely re-inspected, and examine the sidewall and tread for cuts, bulges, or perished rubber, as the Mustang's chunky torque can quickly expose any compromised casing. Beyond the flagged items, the broader mechanical condition of this low-mileage Mustang warrants attention to areas that deteriorate through standing rather than use. Brake fluid should be confirmed as recently changed, as hygroscopic fluid left in situ for many years will have a depressed boiling point and compromised braking performance under repeated heavy use. The rear differential and gearbox oils, often overlooked on low-mileage cars, should be checked for condition and age, and the exhaust system, including the known flexible joint sections typical of the S550 Mustang, should be inspected for corrosion given the age. On a test drive, listen for any clonks from the rear suspension over bumps, particularly from the multi-link trailing arm bushes, and verify that the steering remains tight and free of vibration, as these are the components most likely to reflect the unique combination of light use and age that this vehicle's history implies.